There are only official system requirements on the site which are released by developers or an official publisher.

Minimum system requirements:

CPU:

Intel Core 2 Duo 2.4 Ghz or better, AMD Athlon X2 2.2 Ghz or better

RAM:

2 GB RAM

GPU:

NVIDIA® GeForce® 8800GTS or better, ATI Radeon™ HD 3850 or better

DX:

DirecX® 9/10

OS:

Windows Vista®/XP, Windows 7 https://gamesystemrequirements.com/

Store:

8.5 GB free hard drive space

Sound:

Standard audio device

Note: Internet connection required for game activation. Game not playable until 9/28/10. To play online, activate an online account using a product key. Limit one account per key. [1] product key included.
Features and system requirements may change without notice.

Goodbye GFWL (Games for windows live) hello Steamworks
yes this game is now steamworks so if you have the steam version of this game you will be automatically upgraded to the steamworks version
just to let people know.

@powsix
Like a said on the last comment.
No, or you could, but with lag.
In this game zombies attack you all at once at a mini army rate, and your CPU just doesn't have enough juice to it to handle.
Second, a 64bit GPU just isn't enough for today's games and even back in 2007 when they were released they weren't meant for hardcore gaming, but were preferred for casual gaming on low resolutions and low settings. They are best for media playback and HTPC's.

And as I said, that you may have DX11 installed but your GPU is only capable for DX10, so you wont have any benefits of the DX11 even if you have it installed.